
7.UNITS B-70315EN/02
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7.7.2 Replacement Method
(1) Turn off the power to the CNC, then turn off the main circuit
breaker and power supply for the laser oscillator.
(2) Detach the cable connected to the connector (CN138) located
under the inverter.
(3) Remove the front cover (by removing the set screw), then detach
the cables from the terminal block of the main circuit.
The following cables are connected to the inverter:
R, S, T : Main power supply input
U, V, W : Inverter output
G : Ground
Terminal block Terminal symbol 1 : Reset signal
Terminal symbol 2 : Soft lock signal
Terminal symbol 8 : Reverse command
signal
Terminal symbol 11 : Frequency arrival
signal
Terminal symbols AL0, AL1 :
Alarm output (relay
contact output: Normal
if ON)
Terminal symbol H : 10 VDC
Terminal symbol O : Frequency command
Terminal symbol L : Analog power supply
common
Terminal symbol CM1,CM2 : Common
(4) Remove the inverter (by removing the four set screws).
(5) From the removed inverter, detach the cable (with a bracket)
connected to the terminal block of the control circuit (by
removing the two setscrews securing the bracket).
(6) Remove the front cover of a new inverter, then remove the blind
cover of the cabling section.
Next, instead of the blind cover, attach the cable (with the
bracket attached) originally connected to the old inverter.
(7) Connect the cable to the terminal block of the control circuit.
(8) Mount the new inverter on the oscillator.
(9) Connect the cables to the terminal block of the main circuit.
(10) Install the front cover, and connect the cable to the connector
(CN138).